/* netcalc — Zeichenpapier-Palette, Hairlines statt Schatten, Radius 2px.
   Der Adressraum ist ein gemessenes Intervall: die Skala ist der Held,
   alles andere ist ruhige Instrumentierung. */

:root {
  --paper:        #eef1f4;
  --surface:      #ffffff;
  --surface-sunk: #e6ebf0;
  --ink:          #16212b;
  --ink-soft:     #55636f;
  --ink-faint:    #8794a0;
  --rule:         #c8d1d9;
  --rule-strong:  #a9b6c1;
  --accent:       #e8b21a;
  --accent-deep:  #b5860a;
  --accent-wash:  #fdf4d9;
  --danger:       #a8342a;
  --danger-wash:  #fbeae8;
  --warn:         #8a6410;

  --c0: #2e6f8e; --c1: #7a5c9e; --c2: #3f7d5a; --c3: #a8623a;
  --c4: #4c6ba8; --c5: #7e7430; --c6: #9b4a63; --c7: #2f7f87;

  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "SF Mono", "Cascadia Mono", "Liberation Mono", Menlo, Consolas, monospace;

  --gap: 18px;
  --radius: 2px;
  --shell: 1480px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:        #12171c;
    --surface:      #19212a;
    --surface-sunk: #0d1216;
    --ink:          #dde6ee;
    --ink-soft:     #9aa9b6;
    --ink-faint:    #6b7b89;
    --rule:         #2b3743;
    --rule-strong:  #3f4f5e;
    --accent:       #f0c44a;
    --accent-deep:  #f0c44a;
    --accent-wash:  #2e2712;
    --danger:       #e08375;
    --danger-wash:  #331c19;
    --warn:         #d8b463;

    --c0: #5ba5c6; --c1: #a88ccb; --c2: #62ae85; --c3: #d18e5e;
    --c4: #7d9ada; --c5: #b3a552; --c6: #cd7a92; --c7: #55b0b8;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: env(safe-area-inset-top, 0) 0 env(safe-area-inset-bottom, 0);
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.5 var(--font-ui);
  font-variant-numeric: tabular-nums;
}

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}

main, .rail, .notice, .foot {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 32px);
}

/* ------------------------------------------------------------ Kopfleiste */

.rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px var(--gap);
  padding-block: 14px;
  border-bottom: 1px solid var(--rule);
}

.rail-brand { display: flex; align-items: center; gap: 9px; margin-right: 4px; }

/* Bit-Grenzen als Markenzeichen: vier Striche, von grob nach fein. */
.brand-mark {
  width: 26px; height: 20px;
  background:
    linear-gradient(var(--ink), var(--ink)) 0    0 / 1px 100% no-repeat,
    linear-gradient(var(--ink), var(--ink)) 33%  0 / 1px 62%  no-repeat,
    linear-gradient(var(--accent), var(--accent)) 66% 0 / 3px 100% no-repeat,
    linear-gradient(var(--ink), var(--ink)) 100% 0 / 1px 42%  no-repeat;
}

.brand-name { font-weight: 640; letter-spacing: -0.015em; font-size: 17px; }

.root-form { display: flex; align-items: center; gap: 8px; flex: 1 1 320px; min-width: 0; }
.root-label { color: var(--ink-soft); font-size: 13px; white-space: nowrap; }

.root-input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 7px 10px;
  font-size: 15px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
}

.rail-actions { display: flex; flex-wrap: wrap; gap: 6px; min-width: 0; }

@media (max-width: 700px) {
  /* Die Eingabe ist die Hauptsache und gehört vor die Export-Knöpfe. */
  .root-form { flex-basis: 100%; order: 2; flex-wrap: wrap; }
  .root-label { flex-basis: 100%; }
  .rail-actions { order: 3; }
}

/* ---------------------------------------------------------------- Knöpfe */

.btn {
  padding: 7px 12px;
  font: inherit;
  font-size: 13.5px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--ink-soft); }
.btn:disabled { color: var(--ink-faint); cursor: not-allowed; background: var(--surface-sunk); }
.btn-primary { background: var(--ink); color: var(--paper); border-color: var(--ink); font-weight: 560; }
.btn-primary:hover:not(:disabled) { background: var(--ink-soft); border-color: var(--ink-soft); }
.btn-quiet { background: transparent; border-color: transparent; color: var(--ink-soft); }
.btn-quiet:hover:not(:disabled) { border-color: var(--rule-strong); }
.btn-danger { color: var(--danger); border-color: var(--rule-strong); }
.btn-danger:hover:not(:disabled) { border-color: var(--danger); background: var(--danger-wash); }
.btn-step { padding: 5px 9px; font-size: 12.5px; white-space: nowrap; }
.plan-table .btn-step { padding: 4px 7px; font-size: 12px; margin-left: 3px; }
.btn-wide { width: 100%; }

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--accent-deep);
  outline-offset: 1px;
}

/* -------------------------------------------------------------- Hinweise */

.notice { margin: 10px auto 0; font-size: 13.5px; color: var(--ink-soft); }
.notice:empty { display: none; }
.notice-error {
  color: var(--danger);
  background: var(--danger-wash);
  border-left: 3px solid var(--danger);
  padding: 8px 12px;
  margin-block: 10px;
  border-radius: var(--radius);
}

/* ----------------------------------------------------------- Die Skala */

.scale { padding-block: 22px 8px; }

.scale-ends {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.scale-svg { display: block; width: 100%; }
.scale-svg .seg-click { cursor: crosshair; touch-action: none; }
.scale-svg .seg-click.seg-move { cursor: grab; }
.scale-svg .seg-move { touch-action: none; }
.scale-svg .seg-blocked { cursor: default; }
.scale-svg.is-dragging .seg-move { cursor: grabbing; }
.scale-svg .seg-handle {
  fill: transparent;
  cursor: col-resize;
  touch-action: none;
}
.scale-svg .seg-handle:hover { fill: var(--accent); fill-opacity: 0.85; }
.scale-svg.is-dragging { cursor: grabbing; }
.scale-svg .seg-body { stroke: var(--paper); stroke-width: 1; }
.scale-svg .seg-click:hover .seg-body { stroke: var(--ink); stroke-width: 1.5; }
.scale-svg .overview-dim { fill: var(--paper); opacity: 0.6; pointer-events: none; }
.scale-svg .overview-window { fill: none; stroke: var(--accent); stroke-width: 1.5; pointer-events: none; }
.scale-svg .zoom-funnel { fill: var(--accent); opacity: 0.15; pointer-events: none; }
.scale-svg .create-box {
  fill: var(--accent);
  fill-opacity: 0.3;
  stroke: var(--accent-deep);
  stroke-width: 2;
  pointer-events: none;
}
.scale-svg .create-box.is-bad { fill: var(--danger); stroke: var(--danger); }
.scale-svg .create-text {
  font: 600 11px/1 var(--font-mono);
  fill: var(--ink);
  pointer-events: none;
}
.scale-svg .seg-sel .seg-body { stroke: var(--accent); stroke-width: 3; }
.scale-svg .seg-label { font: 600 11px/1 var(--font-mono); fill: #fff; pointer-events: none; }
.scale-svg .seg-label-dark { fill: var(--ink); }
.scale-svg .tick { stroke: var(--rule-strong); stroke-width: 1; }
.scale-svg .tick-text { font: 10.5px/1 var(--font-mono); fill: var(--ink-faint); }
.scale-svg .base { stroke: var(--ink); stroke-width: 1; }

.scale-summary { margin: 10px 0 0; font-size: 13px; color: var(--ink-soft); }
.scale-summary strong { color: var(--ink); font-weight: 600; }

/* --------------------------------------------------------------- Spalten */

.columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  padding-bottom: 40px;
}

@media (min-width: 1040px) {
  .columns { grid-template-columns: minmax(0, 1fr) 372px; align-items: start; }
  .side { position: sticky; top: 14px; }
}

/* --------------------------------------------------------------- Tabelle */

.plan {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.plan-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--rule);
}
.plan-head h2 { margin: 0; font-size: 14px; font-weight: 640; }
.plan-hint { margin: 0; font-size: 12.5px; color: var(--ink-faint); }

.table-scroll { overflow-x: auto; }

.plan-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }

.plan-table th {
  text-align: left;
  font-weight: 560;
  font-size: 12px;
  color: var(--ink-faint);
  padding: 8px 10px;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}
.plan-table th.num, .plan-table td.num { text-align: right; }
.plan-table th.act, .plan-table td.act { text-align: right; white-space: nowrap; }

.plan-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--rule);
  vertical-align: middle;
}

/* Die Netz-Spalte bleibt stehen, wenn die Tabelle seitlich scrollt —
   ohne sie ist keine Zeile mehr zuzuordnen. */
.plan-table th:first-child,
.plan-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--surface);
  box-shadow: 1px 0 0 var(--rule);
}
.plan-table tbody tr:hover td:first-child { background: var(--surface-sunk); }
.plan-table tbody tr.is-selected td:first-child { background: var(--accent-wash); }
.plan-table tbody tr.row-run td:first-child,
.plan-table tbody tr.row-blocked td:first-child { background: var(--surface-sunk); }
.plan-table tbody tr { cursor: pointer; }
.plan-table tbody tr:hover { background: var(--surface-sunk); }
.plan-table tbody tr.is-selected { background: var(--accent-wash); }
.plan-table tbody tr.is-selected td:first-child { box-shadow: inset 3px 0 0 var(--accent); }
.plan-table tbody tr.is-free td { color: var(--ink-faint); }

.swatch {
  display: inline-block;
  width: 9px; height: 9px;
  margin-right: 7px;
  vertical-align: baseline;
  border-radius: 1px;
}
.swatch-free { background: repeating-linear-gradient(45deg, var(--rule-strong) 0 2px, transparent 2px 4px); }
.swatch-blocked { background: var(--surface-sunk); border: 1px solid var(--rule-strong); }

/* Direkt bearbeitbare Zellen: rahmenlos, bis man sie anfasst. */
.cell-input {
  width: 100%;
  min-width: 0;
  padding: 3px 5px;
  font: inherit;
  font-size: 13px;
  color: inherit;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
}
.cell-input:hover { border-color: var(--rule); }
.cell-input:focus { background: var(--surface); border-color: var(--accent-deep); outline: none; }
.cell-input.is-bad { border-color: var(--danger); background: var(--danger-wash); }
.cell-vlan .cell-input, .cell-need .cell-input, .cell-min .cell-input { text-align: right; }
.cell-cidr { min-width: 19ch; }
.cell-name { min-width: 16ch; }
.cell-vlan { min-width: 6ch; }
.cell-gw   { min-width: 15ch; }
.cell-need { min-width: 8ch; }
.cell-min  { min-width: 8ch; }

.pin-mark {
  margin-left: 7px;
  padding: 1px 4px;
  font-family: var(--font-ui);
  font-size: 10px;
  line-height: 1.3;
  color: var(--ink-faint);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 2px;
  cursor: pointer;
}
.pin-mark:hover { border-color: var(--ink-soft); color: var(--ink-soft); }
.pin-mark.is-on {
  color: var(--accent-deep);
  border-color: var(--accent-deep);
  background: var(--accent-wash);
}

.row-blocked td {
  color: var(--ink-faint);
  background: var(--surface-sunk);
}
.plan-table tbody tr.row-blocked { cursor: default; }
.btn-step.is-on { border-color: var(--accent-deep); color: var(--accent-deep); background: var(--accent-wash); }

.check {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin: 4px 0 2px;
  font-size: 12.5px;
  color: var(--ink-soft);
}
.check input { margin: 2px 0 0; }

.cell-cidr { font-family: var(--font-mono); white-space: nowrap; }

.row-run td { background: var(--surface-sunk); }
.plan-table tbody tr.is-child td:first-child { padding-left: 30px; }
.plan-table tbody tr.is-child .swatch { opacity: 0.65; }

.disclose {
  width: 16px;
  padding: 0;
  margin-right: 4px;
  font: inherit;
  font-size: 11px;
  line-height: 1;
  color: var(--ink-soft);
  background: none;
  border: 0;
  cursor: pointer;
}
.disclose:hover { color: var(--ink); }
.cell-name { max-width: 22ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row-empty { color: var(--ink-faint); font-style: italic; }

/* --------------------------------------------------------------- Panels */

.side { display: grid; gap: var(--gap); }

.panel {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 14px;
}
.panel h2 { margin: 0 0 10px; font-size: 14px; font-weight: 640; }

.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.panel-head h2 { margin: 0; font-size: 19px; letter-spacing: -0.01em; }

.chip {
  font-size: 11.5px;
  padding: 2px 7px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  color: var(--ink-soft);
  white-space: nowrap;
}
.chip-taken { border-color: var(--accent-deep); color: var(--accent-deep); background: var(--accent-wash); }

.facts { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 0 0 14px; background: var(--rule); border: 1px solid var(--rule); }
.facts > div { background: var(--surface); padding: 6px 8px; min-width: 0; }
.facts dt { font-family: var(--font-ui); font-size: 11px; color: var(--ink-faint); margin-bottom: 1px; }
.facts dd { margin: 0; font-size: 13px; overflow: hidden; text-overflow: ellipsis; }

.sizer { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.sizer-label { font-size: 12px; color: var(--ink-faint); margin-right: auto; }
.sizer-value { font-size: 16px; font-weight: 600; min-width: 4ch; text-align: center; }

.field { margin-bottom: 10px; min-width: 0; }
.field label, .toggles legend { display: block; font-size: 11.5px; color: var(--ink-faint); margin-bottom: 3px; }
.field input, .field select {
  width: 100%;
  padding: 6px 8px;
  font: inherit;
  font-size: 13.5px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
}
.field input.mono { font-family: var(--font-mono); }
.field input:invalid, .field input.is-bad { border-color: var(--danger); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.field-narrow { max-width: 100%; }
.field-note { margin: -4px 0 10px; font-size: 12px; color: var(--ink-soft); min-height: 1em; }
.field-note.is-bad { color: var(--danger); }

.gw-row { display: flex; gap: 6px; }
.gw-row input { flex: 1 1 auto; min-width: 0; }

.preview {
  margin: 0 0 12px;
  padding: 8px 10px;
  font-size: 12.5px;
  color: var(--ink-soft);
  background: var(--surface-sunk);
  border-left: 3px solid var(--rule-strong);
  border-radius: var(--radius);
}
.preview strong { color: var(--ink); font-family: var(--font-mono); font-weight: 600; }
.preview.is-bad { color: var(--danger); background: var(--danger-wash); border-left-color: var(--danger); }

.toggles { border: 0; padding: 0; margin: 0 0 12px; }
.toggles label { display: flex; align-items: center; gap: 7px; font-size: 12.5px; color: var(--ink-soft); margin-bottom: 4px; }
.toggles input { margin: 0; }

.panel-actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.panel-actions .btn { flex: 1 1 auto; }

.panel-findings ul { margin: 0; padding-left: 18px; font-size: 13px; }
.panel-findings li { margin-bottom: 5px; }
.panel-findings li.level-error { color: var(--danger); }
.panel-findings li.level-warn { color: var(--warn); }

/* ----------------------------------------------------------------- Rest */

.foot {
  padding-block: 18px 30px;
  border-top: 1px solid var(--rule);
  font-size: 12.5px;
  color: var(--ink-faint);
}
.foot p { margin: 0; }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  padding: 9px 16px;
  font-size: 13.5px;
  color: var(--paper);
  background: var(--ink);
  border-radius: var(--radius);
  z-index: 10;
}

[hidden] { display: none !important; }

@media (prefers-reduced-motion: no-preference) {
  .toast { animation: toast-in 160ms ease-out; }
  @keyframes toast-in { from { opacity: 0; transform: translate(-50%, 6px); } }
}

@media print {
  .rail-actions, .side, .plan-hint, .foot, .toast, .root-form .btn { display: none !important; }
  body { background: #fff; color: #000; }
  .plan, .panel { border-color: #999; }

  .plan-table tbody tr.is-selected { background: none; }
  .plan-table th:first-child, .plan-table td:first-child { position: static; box-shadow: none; }
  .cell-input { border-color: transparent !important; background: none; }
  .plan-table td.act { display: none; }
  .plan-table th.act { display: none; }
}